A researcher at MSU's Center For Biofilm Engineering examines a flask of cultivated algae as part of a biofuel experiment in April 2018. (MSU photo by Kelly Gorham)

"This could transform the algae biofuel industry," said Gerlach, one of the project's principal investigators.

Like soybeans, camelina and other crops, algae contain oily substances that can be extracted and refined into biodiesel, which differs from ethanol and other alcohol-based liquid fuels produced by fermentation. Typically, algae are cultivated in large water tanks where carbon dioxide is injected to stimulate the growth of the tiny, photosynthesizing organisms.

Interest in algae biofuel peaked during the 1970s energy shortages and has since ebbed and flowed in response to oil prices. But the costs associated with supplying the algae with supplemental carbon dioxide from sources such as coal-fired power plants have discouraged commercial production, according to Gerlach.

Now, the researchers think that a recently discovered strain of algae could be cultivated using only the ambient carbon dioxide of the atmosphere.

"We're really excited about this," said Brent Peyton, professor of chemical and biological engineering and director of MSU's Thermal Biology Institute. Together with Gerlach and others, Peyton has studied algae biofuels at MSU for more than a decade.

The algae, called SLA-04, was discovered by the project's University of Toledo researchers in an eastern Washington lake containing high levels of carbonate minerals similar to baking soda. In the lake's unique environment, these algae have been shown to metabolize ambient carbon dioxide very efficiently, Peyton said.

"In the past we've found some algae and tried them out (with making biofuel)," Peyton said. "Now we're using state-of-the-art tools to move the technology forward. This is really quite advanced for a project on algae biofuel."

For instance, the team will sequence the algae's DNA and then use a process called metabolic mapping to identify which genes correspond with the algae's biochemical strategies under a variety of conditions.

"Ultimately, we want to optimize those strategies for biofuel production," said chemical and biological engineering professor Ross Carlson. For example, the results could be used to fine-tune the amount of carbonate mineral added to the cultivation tanks.

"I feel fortunate to be part of such an accomplished research team," Wiedenheft said, adding that the project could also provide insights into algae biology because much remains unknown about the genome of the aquatic organisms.